Drive and full-stroke mechanism



- C W. ADSHEAD DRIVE AND FULL-STROKE MECHANISM Filed Jan. 30, 1950 IKpnl 13, 1954 5 Sheets-Sheet l I INVENTOR CHARLES WADSHEAD .BYZ Q z'mom:

. m pa T 1.

A ril 13, 1954 c. w. ADSHEAD 2,674,894

DRIVE AND FULL-STROKE MECHANISM Filed Jan. 50, 1950 5 Sheets-Sheet 2'CHARLES w ADSHEAD ZVMJMLM ATTMIIEYS DRIVE AND FULL-STROKE MECHANISMFiled Jan. 30, 1950 5 Sheets-Sheet 5 J IHVENTOR CHARLES W ADSHEAD.(TTMNEYS INVENTOR 7 MW ATTDRNEYS April 1954 c. w. ADSHEAD DRIVE ANDFULL-STROKE MECHANISM Filed Jan. 30, 1950 5 Sheets-Sheet 4 CHARLES WADSHEAD April 13, 1954 c. w ADSHEAD 2,674,894

DRIVE AND FULL-STROKE MECHANISM Filed Jan. 30, 1950 5 Sheets-Sheet 5INVENTOR CHARLES W ADSHEAD B) ATTORNEYS Patented Apr. 13, 1954 ca:

; UNITED) STATES PATENT OFFICE I v DRIVE ANDFULL-STROKE, MECHANISMCharles William Adshead London, England, as-

signor to Setright Registers Limited, London. England, a British companyApplicationJanuary 30, 1950, Serial No. 141,224

Claims priority, application Great Britain February 3, 1949 1 Claim.(01. 74-'142) and ratchet wheel preventing reverse movement,

of the handle and means for automatically disengaging the non-returnpawl from the ratchet wheel when the handle reaches the end of itsoperating stroke and to hold the pawl disengaged during the returnstroke of the handle whereby it is necessary to effect a completeoperating stroke of the handle before it can be returned to its startingposition. In one arrangement of the machine the driving ratchet wheel ora wheel movable therewith, is rotated by the handle during its operativestroke and remains stationary during the return stroke and has teeth atspacings corresponding to a complete operating stroke of the handle,engaged by a detent when the handle is at the end of its stroke and thedetent is arranged when engaged in a tooth to release the pawl on thenon-return ratchet wheel.

A specific embodiment of a machine accordingto the invention forprinting and preparing for use adhesive wrapping tapes will now bedescribed by way of example, and with reference to the accompanyingdrawings in which:

Figure 1 is a perspective view of the machine,

Figure 2 is a view in the direction IIII in Figure 3 showing the platenand associated mechanism,

Figure 3 is a view in the direction IIIIII in Figure 2,

Figure 4 is a view in the direction IV--IV in Figure 2,

Figure 5 is an enlarged sectional view of part of the platen operatingmechanism shown in Figure 2,

Figure 6 is a detail view in the direction IX-D in Figure 5 (part ofratchet wheel 94 being shown cut-away to expose part of ratchet wheel92), and

Figure 7 is a detail View in the direction X-X in Figure 5.

The machine according to this example is mounted on a rectangular baseplate I and is intended to be secured to the edge of a packing table(seeparticula-rly Figure 1). r

The machine comprises a vertically movable platen 52 which "has adownwardly extending stemfifi supported in a guide bearing 58 and afurther bearing 00-; '"The' stem is provided with a collar 02intermediate-its length, and a compression spring'fid' is mounted aroundthe stem be-' tween the collar 02 and the guide bearing 50, such'thatthespring-urges the collar 62 and 'so the platen 52 vertically upwards intoits operating or printing positiom; A'cam 66b engages-the upper surfaceof the collar 62 so that, on rotation of the cam,-:the ,platen'ismovedalternately to-its Operating position by the spri and then from itsoperating position by the action of the cam.

The cam shaft 08 carries a gear which is free on the shaft and isengaged by a quadrant 02 pivoted to the casing at 84 and secured to anoscillatable operating handle 85 (Figures 2 and 3). The shaft 68 issupported in bearings in a sub-frame 8B, 81 (Figure 5) and the gear 80has a boss which passes through the bearing in the frame member 80 andis secured to a disc 88 and a ratchet wheel 90 (Figure 5). The cam 66bwhich is fixed to the shaft 68 has a boss I 66 passing through thebearing on the frame member 81 and secured by pins I6! to two ratchetwheels 92, 94 each of which has two teeth. The teeth I94 of the wheel 94have rear faces 294. Each ratchet tooth I94 extends circumferentiallyaround wheel 04 from its rear face 204 to the rear face 204 of the othertooth I94, and each tooth I94 includes a sloping portion 304. The disc80 carries a pawl 90 which engages the ratchet wheel 92 and thearrangement is such that when the handle 85 is operated by movement fromthe upright position to the lower position shown in Figure 3 the wheel80 is rotated half a turn and, by engagement of the pawl 96 with thewheel 92, rotates the cam 06b half a turn. Independently pivoted on ashort shaft I00 supported in the sub-frame there are two pawls I02, I04spring-urged together against a stop I06 on the pawl I02 by a spring I08(Figures 5 and 7). The pawl I02 engages the wheel 94 and is spring urgedinto such engagement by a spring H0. The purpose of the arrangement justdescribed is to prevent return movement of the handle 85, after anoperating stroke has been begun, until the stroke has been completed. Atthe beginning of an operating stroke the pawl I02 rides up the side I I2of the notch in the wheel 90 and the two pawls I02, I04 are rocked, as aunit, anti-clockwise thereby to engage the pawl I04 in the teeth of thewheel 90 and to prevent backward movement of the wheel 90 andconsequently of the handle. When the pawl I04 drops into the next notchin the wheel 94 the pawls I02, I 04 are swung clockwise as a unit andthe pawl I04 is disengaged from the wheel 90 thereby freeing the handlefor return movement.

The invention is not restricted to the details described in the aboveexample. It may, for instance, be applied to the printing of additionalinformation on pre-printed labels or slips. Further the tape reel andthe supporting bearings therefor may be incorporated'iii'the casing forthe printing mechanisms.

I claim:

In a machine for printing identification tabs, labels and tapes forsecuring wrappings, a drive and full-stroke mechanism comprising anoscillatory handle, a rotatable shaft, an operative connection betweensaid handle and said shaft, said operative connection comprising apawl-and-ratchet' device constituting a one-way clutch, whereby saidshaft is driven to rotate on movement of the handle in one direction, asecond pawl-and-ratchet device associated with said handle andconstituting a one-way brake operative to prevent reverse rotation ofsaid handle, means for automatically rendering said secondpawl-and-ratchet device inoperative when said handle completes a forwardstroke of predetermined length in the said one direction and formaintaining said second pawl-and-ratchet device inoperative during areturn stroke of the handle in the opposite direction, which meanscomprise at least one ratchet tooth extending around the shaft androtatable therewith, said ratchet tooth having a circumferential lengthcorresponding to the amount of rotation of the shaft produced by acomplete forward stroke of the handle, a detent pawl, resilient meansurging said detent pawl to ride on the said ratchet tooth during theforward stroke of the handle and to engage behind the tooth when thehandle reaches the end of its forward stroke, a connection between thedetent pawl and the pawl of the said second pawl-and-ratchet deviceoperative to disengage the said pawl of the said second pawl-and-ratchetdevice from the ratchet thereof on movement of the said detent pawl toengage behind the said ratchet tooth as aforesaid and to maintain saidpawl of said second pawl-andratchet device disengaged from said ratchetthereof during said engagement of said detent pawl behind said ratchettooth.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,106,995 Verner Aug. 11, 1914 1,393,232 Manshel Oct. 11, 19211,523,574 Baty Jan. 20, 1925 1,831,700 Blanchard et al. Nov. 10, 19311,890,598 Boyer Dec. 13, 1932 2,017,920 Rost Oct. 22, 1935 2,100,027Faris Nov. 23, 1937 2,203,115 Wagner June 4, 1940 2,488,766 De Moss Nov.22, 1949 2,586,040 Hoare Feb. 19,1952

